
11Beamage-3 User
’s Manual Revision 4.0
58
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ANNEX A ISO11146 AND ISO11670 DEFINITIONS
The beam centroid coordinates are given by:
The beam widths are defined as an
“extent of a power density distribution in a cross section of beam
based
on the centered second order moments of the power density distribution.”
The second order moments of power density distribution are given by:
The beam widths are given by:
where:
The major axis is the width
’s maximum whereas the minor axis the width’s minimum.